Phytophthora inundata

Name and publication

Phytophthora inundata Brasier, Sanchez-Hernandez & Kirk (2003)

Brasier CM, Sanchez-Hernandez E, and Kirk SA. 2003. Phytophthora inundata sp. nov., a part heterothallic pathogen of trees and shrubs in wet or flooded soils. Mycological Research 107: 477–484.

Corresponding author:


from Brasier et al. (2003)




refers to the species' habitat in rivers, ponds, and flooded or wet soils


Types: slide of the oogonia and antheridia of paired isolates IMI 390141 (holotypus)

Paratypes IMI 389751 and IMI 390121

IMI 389751 = UNITED KINGDOM, Bexley, Kent, from roots of Salix matsudana, 1976, C. M. Brasier & R. G. Strouts, IMI 389751 = P246b, an A2 sexual compatibility type

IMI 390121 = SPAIN, Ecija Sevilla from Olea roots, 1966, E. Sanchez-Hernandez IMI 390121

Ex-paratype: CBS 216.85 and P8479

Sequences for selected specimens in original publication: IMI 389751 = ITS rDNA AF266791

NOTE: Nomenclature under revision.

Paratype(s) in other collections

IMI 389751 = P246b = CBS 216.85, P8479 (WPC), A. de Cock, No. 8312, CPHST BL 20 (Abad), 30J3 (Yang)

Molecular identification

Voucher sequences for barcoding genes (ITS rDNA and COI) of selected specimens (see Molecular protocols page)

Phytophthora inundata isolate CPHST BL 20 (= P8479 WPC) = ITS rDNA MG865516, COI MH136910

Phytophthora inundata isolate CPHST BL 130 (= P19967 WPC) = ITS rDNA MG865517, COI MH136911

Sequences for ex-paratype(s) in other sources
Position in ITS phylogenetic tree

Clade 6a

Morphological identification

Colonies and cardinal temperatures

Colony morphology on V-8A with no distinctive pattern, on PDA and MEA with light chrysanthemum pattern. Minimum growth temperature 3°C, maximum 36°C, and optimum 27–30°C.

Asexual phase

Sporangia nonpapillate; persistent; ovoid, obpyriform (30–68 μm length x 20–52 μm width) sometimes with tapered bases; showing internal proliferation; originated in unbranched or simple sympodial sporangiophores, sometimes with swellings in sporangiphore. Hyphal swellings globose, subglobose, irregular, individual or catenulated and many times with radiating hyphae. Chlamydospores absent.

Sexual phase


Specimen(s) evaluated

Phytophthora inundata CPHST BL 20, duplicate of P8479 (World Phytophthora Collection)

Phytophthora inundata CPHST BL 130, duplicate of P19967 (World Phytophthora Collection)

Hosts and distribution

Distribution: Europe (France, Denmark, Hungary, Spain, UK), Asia (India), Australia, South America (Brasier et al. 2003), recently isolated from roots of alfalfa in CA (Ho et al. 2006)
Substrate: roots, collars of trees and shrubs in wet or flooded soil; debris, water
Disease note: root and collar rot
Host: plants in multiple families, including Aesculus hippocastanum (chestnut, Sapindaceae), Medicago (alfalfa, Fabaceae), Olea (olive, Oleaceae), Salix (willow, Salicaceae) and Vitis (grapevine, Vitaceae)

Retrieved January 31, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional references and links

Fact sheet author

Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America